Koford, R. 1974 Journal 15 Dec. 9.2 mi. E, 6.6 mi. S Colonia Cardenas, Baja Calif. del Norte, Mexico ~ 1050m, and P. truii, and Neotoma fuscipes, in addition to 3 Batrachoseps which were caught by Bradford, Glanz, and Eschrich near what seemed to be permanent water coming from a spring at Oak pasture. We spent the morning sorting, sexing, and taking reproductive data from Peromyscus maniculatus from San Telmo. See Dr. Lidicker's field notes for details. We left around noon, stopping at Oak Crossing and walking to Oak pasture. We took about an hour to look for more salamanders and to enjoy the green meadow. Then we went back down the mountain, turning north toward Mike's Sky Rancho about a mile west of the valley that Poling Ranch is in. We went to Mike's, then toward the Valle de Trinidad. We got to within a couple miles of the main road going into Colonia Cardenas and decided to camp where we could still be within trapping distance of the rocky hills. We camped about 100 m. E of the road at the base of the hills, overlooking a wide flat valley. We were apparently at the upper end of the Lower Sonoran zone, because we had just seen creosote bush and ocotillo. In addition to those, there were several barrel cacti in the area, many yuccas, some acacias, some cholla, and a lot of sand. We set up camp and spent the evening processing material and putting up skins, in addition to setting out traps. There were many Dipodomys holes around, and several